| ARP 7 | |
| Credit: | Halton Arp |
| Epoch: | J2000 |
| Type: | SB(rs)bc [1] |
| Ra: | [2] |
| Dist Ly: | NaNMpc |
| Z: | 0.018356 ± 0.000027 (5503 ± 8 km/s) |
| Appmag V: | 12.40 |
| Size V: | 57.1″ × 52.53″ |
| Size: | 1.6kpc (23kpc?) (estimated) |
| Constellation Name: | Hydra[3] |
| Names: | PGC 024836, APG 7 |
Arp 7 (PGC 24836) is a spiral galaxy in the constellation Hydra. Redshift-independent measurements of its distance vary widely, from 5.9 Mpc to 83.7 Mpc. Its morphological classification is SB(rs)bc, meaning it is a barred spiral galaxy with some ring-like structure.
Arp 7 was imaged by Halton Arp and included in his Atlas of Peculiar Galaxies under the category of 'split arm' galaxies.[4] Five other galaxies are also included in this section of the atlas: Arp 8 (NGC 497), Arp 9 (NGC 2523), Arp 10 (UGC 1775), Arp 11 (UGC 717), and Arp 12 (NGC 2608).